1 files changed, 126 insertions, 0 deletions
diff --git a/2023/day10.rs b/2023/day10.rs
new file mode 100644
index 0000000..919223c
--- /dev/null
+++ b/2023/day10.rs
@@ -0,0 +1,126 @@
+#![allow(dead_code)]
+#![allow(unused_variables)]
+#![allow(unused_mut)]
+use num::complex::Complex as c;
+use num::Complex;
+use std::fs::File;
+use std::io::Read;
+
+#[derive(Debug, PartialEq, Clone, Copy)]
+enum Dir {
+    Start,
+    UD,
+    LR,
+    UR,
+    UL,
+    DL,
+    DR,
+    Ground,
+}
+
+const LUT: [(Dir, Complex<i32>, Complex<i32>, char, char); 8] = [
+    (Dir::UD, c::new(0, 1), c::new(0, -1), '|', '│'),
+    (Dir::LR, c::new(1, 0), c::new(-1, 0), '-', '─'),
+    (Dir::UR, c::new(0, -1), c::new(1, 0), 'L', '└'),
+    (Dir::UL, c::new(0, -1), c::new(-1, 0), 'J', '┘'),
+    (Dir::DL, c::new(0, 1), c::new(-1, 0), '7', '┐'),
+    (Dir::DR, c::new(0, 1), c::new(1, 0), 'F', '┌'),
+    (Dir::Start, c::new(0, 0), c::new(0, 0), 'S', 'S'),
+    (Dir::Ground, c::new(0, 0), c::new(0, 0), '.', ' '),
+];
+
+fn lookup(d: Dir) -> (Dir, Complex<i32>, Complex<i32>, char, char) {
+    for i in 0..LUT.len() {
+        if d == LUT[i].0 {
+            return LUT[i].clone();
+        }
+    }
+    panic!();
+}
+
+fn print_m(m: &Vec<Vec<Dir>>) {
+    for i in 0..m.len() {
+        for j in 0..m[0].len() {
+            print!("{}", lookup(m[i][j]).4);
+        }
+        println!();
+    }
+    println!();
+}
+
+fn find_start(m: &Vec<Vec<Dir>>) -> Complex<i32> {
+    for x in 0..m.len() {
+        for y in 0..m[0].len() {
+            if m[y][x] == Dir::Start {
+                return (x as i32) + (y as i32) * c::i();
+            }
+        }
+    }
+    panic!();
+}
+
+fn next(
+    mut pos: Complex<i32>,
+    mut dir: Complex<i32>,
+    m: &Vec<Vec<Dir>>,
+) -> (Complex<i32>, Complex<i32>) {
+    pos += dir;
+
+    let (_, a, b, _, _) = lookup(m[pos.im as usize][pos.re as usize]);
+
+    dir *= -1;
+
+    if dir == a {
+        dir = b;
+    } else if dir == b {
+        dir = a;
+    } else {
+        // panic!();
+    }
+    (pos, dir)
+}
+
+fn main() {
+    // let filename = "in/day10.ref";
+    let filename = "in/day10.pzl";
+
+    let mut f = File::open(filename).expect("cannot open file");
+    let mut content = String::new();
+    f.read_to_string(&mut content).expect("cannot read file");
+    let lines = content.trim_end().split('\n');
+
+    let mut m: Vec<Vec<Dir>> = Vec::new();
+    for line in lines {
+        let mut r = Vec::new();
+        for c in line.chars() {
+            for m in LUT {
+                if m.3 == c {
+                    r.push(m.0);
+                }
+            }
+        }
+        m.push(r);
+    }
+
+    let mut res1 = 0;
+    let mut res2 = 0;
+
+    print_m(&m);
+    let start = find_start(&m);
+
+    let mut pos = start;
+    let mut dir = c::new(1, 0);
+
+    (pos, dir) = next(pos, dir, &m);
+    res1 += 1;
+
+    while pos != start {
+        (pos, dir) = next(pos, dir, &m);
+        res1 += 1;
+    }
+    res1 /= 2;
+    println!("{} {}", pos, dir);
+
+    println!("res1: {}", res1);
+    println!("res2: {}", res2);
+}